#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <limits.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>

#define FIFO_NAME "/tmp/moje_fifo5"

#define BUFFER_SIZE PIPE_BUF
int main(int argc , char *argv[])
{
  int res;
  int pipe_fd;
  int open_mode=O_RDONLY;
  char bufor[BUFFER_SIZE+1];
  int zczytane=0;
  char buf[20];

  memset(bufor,'\0',sizeof(bufor));
if(access(FIFO_NAME, F_OK)==-1)
  {

    res=mkfifo(FIFO_NAME,0666);

    if(res ==0) printf("Kolejka FIFO utworzona\n");
    else
    {
      printf("B??d %d - %s tworzenia kolejki %s\n",errno,strerror(errno),FIFO_NAME);
      exit(1);
    }
  }
  printf("Proces %d otwiera FIFO \n",getpid());


  pipe_fd=open(FIFO_NAME,open_mode);
  printf("proces %d warto?c %d\n", getpid(),pipe_fd);

  sprintf(buf,"ls -l /proc/%d/fd",getpid());
  system(buf);

  if(pipe_fd!=-1)
{
    do{
      res=read(pipe_fd,bufor,BUFFER_SIZE);
      zczytane+=res;
      int z;
      char a = bufor[0];
      int ia = a - '0';
      char b = bufor[2];
      int ib = b - '0';
      int c = 0;
      if(bufor[1] == '+'){
	c = ia + ib;
	printf("%d",c);
      }
      if(bufor[1] == '/'){
	c = ia / ib;
	printf("%d",c);
      }
      if(bufor[1] == '-'){
	c = ia - ib;
	printf("%d",c);
      }
if(bufor[1] == '*'){
	c = ia * ib;
	printf("%d",c);
      }
      printf(" to wynik dzialania : %s\n",bufor);
    }while(res>0);

    close(pipe_fd);
  }
  else
    exit(1);

  printf("proces %d zko?czony zczytano %d\n", getpid(),zczytane);


return 0;
}